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首页> 外文期刊>Thermal engineering >Import Substituting Water-Chemistry Technologies on the Basis of Amine-Containing Reagents for Combined-Cycle Power Plant Steam Generators
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Import Substituting Water-Chemistry Technologies on the Basis of Amine-Containing Reagents for Combined-Cycle Power Plant Steam Generators

机译：Import Substituting Water-Chemistry Technologies on the Basis of Amine-Containing Reagents for Combined-Cycle Power Plant Steam Generators

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Abstract— The last decade has seen the widespread use of water chemistry with metering polyamines into the coolant of steam boilers and heat-recovery steam generators (HRSG) of combined-cycle power plants (CCPP) at thermal power plants in Russia and Western Europe. Water chemistry with complex reagents of the Helamin and Cetamin trademarks began to oust the conventional all-volatile water chemistry. However, such factors as high cost and unclear component composition of imported reagents generated the need to develop similar domestically produced reagents. Complex reagents of the VTIAMIN and, in particular, VTIAMIN KR-33 types have become such ones. Due to selecting the concentrations of individual components in the complex reagent’s composition, it has become possible to loosen the previously formed deposits and remove them from the heat-transfer equipment surfaces and obtain a significantly lower formation rate of new deposits, and, hence, the corrosion rate of heat-transfer surfaces. The article presents the results obtained from pilot commercial tests of the VTIAMIN KR-33 reagent in the HRSGs of CCPP-based power units in using various thermal cycle process circuits. These tests were carried out with the aim to solve various process-related tasks within the framework of implementing the program of substituting the imported polyamine water-chemistry technology. It has been found in the course of performing pilot commercial tests in 110-MW CCPP units that it is possible to jointly use VTIAMIN KR-33 and VTIAMIN D-2 reagents to reduce the corrosion rate of copper-containing alloys and stabilize the copper content over the power unit’s steam–water path. The tests revealed an increased content of carbonic acid in the steam, which entails violation of the steam quality standards in terms of the H-cationized sample electrical conductivity indicator. The thermal cycle process circuits with sequential (the 110-MW CCPP) and parallel (the 450-MW CCPP) feeding of low- and high-pressure drums (LPD and HPD) were compared with each other. It has been shown that the violation of the standard water chemistry in the case of a high carbonic acid content in the 110-MW CCPP unit’s path results from inefficient operation of the deaerator built into the LPD design.

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